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The principle of antifouling of polished tiles

by:JIABANG     2021-06-04
The antifouling principle of polished tiles is based on the principle of solid surface modification, that is, the solid surface adsorption characteristics are used to change the structure and properties of the solid surface through various surface treatments. The antifouling substance is also the surface active substance. The surface of the ceramic tile forms a layer of adsorption film, which is hydrophobic, so that the tile has an antifouling effect. Currently, silicones and fluoropolymers are widely used in the field of polished tile antifouling due to their low surface tension, excellent weather resistance and durability, and chemical reactivity. 1 Antifouling technology of waxes, organic coatings and hydrophobic surfactants Waxes and organic coatings are more commonly used antifouling treatment agents for the surface of polished tiles, but the effect has not been satisfactory. Although waxing can prevent stains, the surface tension of wax is relatively large, and the time to stay on the surface of the tile is short. In addition, wax is a coating material and an airtight sealant. After waxing, external water and moisture cannot enter the inside of the decking tile, which isolates water vapor and has a good antifouling effect. However, the wax is prone to yellowing when exposed to the air and sunlight for a long time, and the wax film is easy to wear. The antifouling effect is short, and the wax itself is easily contaminated. Small particles such as dust will be embedded in the wax to form wax dirt, which is very inconvenient to clean. Therefore, waxing is not a good antifouling measure. In addition, applying organic coatings affects the gloss of the polished tile surface. Hydrophobic surfactants have low surface tension. Small-molecule hydrophobic surfactants mainly include stearic acid, palmitic acid, oleic acid, naphthenic acid mixtures, rosin acid and their alkali metal water-soluble salts, and their surface tension Larger, in the range of 30-40mN/m. between. The surface of the ceramic tile treated by it adsorbs and forms a thin hydrophobic layer, which has a certain anti-fouling effect. However, because it is only adsorbed on the surface and is not firmly bonded, it is easy to fall off under the impact of external force or water flow and lose the anti-fouling effect. Poor pollution effect, durability and anti-fouling efficiency. 2 Organic silicon antifouling technology The surface energy of polished tile surface treatment agent is a very important factor in the antifouling performance of polished tile surface. The low surface energy can prevent the adsorption of dust, microorganisms, water-based substances, particles, etc., and it is easy to desorb under the action of external force. Organosilicon has a low surface tension, which can be as low as 21-22mN/m. It is an ideal and widely used water-proof and antifouling treatment agent for polished tiles. The principle of silicone antifouling treatment agent is different from the commonly used surface treatment agents. The silicone surface antifouling treatment agent chemically reacts with structural materials to form a layer of insoluble hydrophobic resin film with a thickness of several molecules on the surface of the tile. , Not only has the water repellency and anti-staining properties, but also maintains the normal air permeability of the tiles. Ceramic tiles treated with silicone surface have the characteristics of keeping clean, non-sticky, easy to clean, and excellent scrubbing resistance, and are more and more popular in the market. 3 Fluorine-containing low surface energy type antifouling technology Fluorine-containing compounds have very low surface energy, the surface tension of perfluoroalkanes is as low as 10mN/m, and the contact angle ratio with silicone is 110:101, so it has better antifouling resistance. Stick ability. Although fluorine-containing compounds have better antifouling performance, they are relatively expensive and are not very mature in the field of tile antifouling technology. Therefore, fluorine compound antifouling technology is rarely used at present. With the continuous advancement of science and technology, people are modifying it through various methods, and I believe it will get closer and closer to us.
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